Screen roll



J ly 1 5, 1930. J. L. BEIQGEROVN 1,770,834

SCREEN ROLL Filed Dec. 10, 1928 3 Sheets-Sheet l 5O Z9 25\ 52 s a 45. I9 I 5 Z0.

V -INVENTOI ma i-1W ATTORNEY.

July 15, 1930. J. L. BERGERON 1,770,834

SCREEN om,

Filed Dec. 10, 1928 3 Sheets-S1569i. 2

INYENTOE ATToeME July 15, 1930. J. L. BERGERON 1,770,834

SCREEN ROLL Filed Bags. 10, 1928 3 Sheets-Shegt 3 w 50. 47 p 53 l 49.

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- 4o. F167 Ex A ToEN Patented July 15, 1930 UNITED STATES sominn Ron. 7i

Application filed December '10,. 192 8. sear m. were.

The inventiorr'relates to a screen roll, as described in the presentspecification and illustrated in the accompanying drawings that formpart of the same.

The invention consists essentially of the novel features of constructionpointed out broadly and specifically in the claims for novelty followinga description-containing an explanation indetail of an acceptable formof the invention The objects of theinventionare to elimina-te theframeor' frames within cylindrical rolls, particularly those formed ofwiremesh or other like material, and supportthe cylinder entirely from theend or head by maintaining the screen in tensionthroughout; to avoidirregularities on the sheet of pulp in paper making due to thedeposit'of dirt or,

other particlesor loose endsfrequently picked up and redeposited bydandyrolls; to facilitate-the operation of'dandy-rolls sothat there willbe no slipor drag, and no separa-' tion of the fibres from the pulp, andat the same time insure that the roll will always be in a cleanlycondition thereby maintaining an even surface and an'even thickness ofthe sheet being produced; to do away with dented, creased or rollsotherwise deformed by enabling the-operator to replace a roll with greatfacility or straighten the'rollout and keep it soby'constant pull on theends thereof; to drive a roll without distortion of the light materialand yet drive it entirely to one end thereof; to produce aroll forspecial usesinindustrial pursuits that will keepitsshapeunder mostconditions without being encumbered by an interior frame,

and-generally to provide at a moderate cost of-production a screen roll;light and durable and efiicient in operation.

In the drawings, Figure 1-; is a front e'leg vational view of the-screenroll and-expanding frames.

Figure 2 is-an elevational viewshowing theframe at one endand drivingmechanism. Figure 3" is anelevational vlew showing the frame at theother end. a

Figure 4 is a longitudinal sectional view Figure 5 -i's" a longitudinalsectional" View of the screen roll and contiguous part'son the line5"-'5 in F igure=2l I Figure 6 is across section'l View on the line 6+6in Figure 1'."

V Figure 7 is a sectional detail of thesl'i'de mounting of the frames vLike numerals of reference. indicate-[corresponding parts'in the variousfi ures- V In the description hereinafter'given in-this invention, theuse oft'he screenroll will be confined to itsoperation in paper making,that is to' say,- it will be explained that thisscreen roll isparticularly adaptable as a dandy roll-,- th'ough nothinghereinafternintioned' need in any way confine-the invention to-this particularpurpose.- v

Referring to the drawings,- tlieda'nd'y roll herein illustrated is inthe form of a cylindrical" screen 15 of wire mesh secured oi-r-the ringflanges I6 and 17 at the ends, saidv flangesbeing preferably in the of a'dise surrounding the hubs 18 anud 19' screwed on to thetrunnions" 20and21-,= and forming the heads and journal-membersofa rot'ating' screendrum;

The drivingbevel gear transmission spur gear 23, and these two gears aresecured through their web24 by thebolts25, to tlrieflanges I6and 17 andare mounted through their hub 2'6' on theitru-nnion 20and'secu-redthereon by the key-27'.

The'transmi'ssion spur gear- 28-i s secured by the bolts 29m the flange17- and ismo'unted by means of the hub '30 on the-ftrunnion-2l andsecured thereto by the key '31; 1

The slidingb'earing frames 32 and-33 carry the trunnions 2'0 and 21-respectively and are locked thereon by the end' thrust bearings' '34 and35 respectively screwed to -tlietrunnion's; The; slidingbearing brackets32 and 33 extend"- upwardly and are slidablymounted dovetails-3'8mounted on the dovetail grooves- 39 and the adjustingwedge pins 40 usedin adjusting} thesliding connections of the sliding and fixed brackets:

'rhebraeketsse and 33 fiareoutwardly on each side forming infltliebracket Bit-supports" for therodi la extending frolnthepistons' 43.

The cylinders are connected by the feed pipes 44 to a suitable supply ofexpanslle fluid, therefore it will be seen that on feeding air or steaminto the cylinders 41 the pistons will be driven outwardly carrying therods 42, and as the rods 42 are fixedly secured to the bracket 32 andthe cylinders 41 fixedly secured to the bracket 33, naturally thebrackets will be forced apart on each side of the screen 15, thuspulling on the screen from the ends, as the screen is firmly-held tosaid brackets by the thrust bearings 34 and 35, consequently anyinequalities of the screen must be immediatelysmoothed out by theconstant tension on said screen applied through the said cylinders andpistons operating therein. 7

The spray pipe 45 having the jet orifice 46 extends through the hollowtrunnions 20 and 21 and out through the casings 47 and 48 enclosing saidtrunnions and thrust bearings 34 and the roller bearings 49, and it isby means of this spray pipe that the wire mesh screenis kept in acleanly condition.

. The drip pan 50 is supported from the brackets 32 and 33 and extendspartly under the screen so thatall the water sprayed on the inner wallof the screen will be caught by said pan. I

The transmission spur gears 51 and 52 coact with the transmission gears23 and 28 respectively, and are mounted on the common shaft 53journalled in the brackets 32 and 33.

The driving bevel is driven by the coacting driving bevel 54 mounted onthe main shaft 55, which is connected to any suitable power, thus whenthe bevel gear 22 is drlven the transmission gear 23 rotates therewithas it is part thereof, and as the transmission gear 23 coacts with thetransmission gear 51, the transmission gear 52 must coact with thetransmission gear 28, thus the motion from the driving bevel gear 54 istransmitted to the opposite end of the screen roll thereby avoiding thedistortion of the roll through the driving at one end only.

The main shaft 55 is journalled in the bearings 56 on the slidingbracket 33 and diametrically opposite the main shaft and main drivingbevel gear.

The bevel gear 57 coacts with the bevel gear 22 and is mounted on theshaft 58 slidable in the bearings 59 secured to the bracket 32 andlocked therein by hinged strap 60.

The shaft 58 at its outer end carries the hand wheel 61 by means ofwhich the bevel 57 is turned to rotate the screen roll, in theassembling of the parts, but during the operation, the bevel gear 57 isremoved from coaction with the bevel gear 22 and drawn completely awaytherefrom, so that it is quite out of the way during the operation ofthe dandy roll in paper making.

In the assembling and in the operation of this machine, the cylindricalroll of Wire mesh is mounted on the end flanges which are screwed on tothe trunnions, these trunnions being mounted in bearings in the slidablebrackets and held securely in said brackets by end thrust bearings.

These brackets are connected by the pistons and cylinders and areslidably mounted on the fixed brackets, consequently when the parts areall assembled, the pistons are operated in the cylinders by means ofexpansile fluid and the brackets supported to the fullest extent thatthe screen drum or roll will allow, and in consequence of this the wiremesh is continuously in tension.

The driving bevel gear on the main shaft and the coacting driving bevelgear on the screen insure the rotation of said screen on the wire of theFourdrinier machine, and as this dandy roll is driven it smooths out thesheet of pulp passing and squeezes out excess water and generallyperforms all the functions that a dandy roll usually performs, thesalient features of this particular dandy roll being the means ofmaintaining the wire mesh in constant tension and thereby eliminating aninterior frame, the means of keeping the wire mesh roll in a cleanlycondition, and the means of avoiding the eflects of distortion anddriving from one end and the constructional features whereby the rollmay be removed for repair and replaced with great facility.

All of these features are very important and may constitute novelelements both in a dandy roll form of machine and in any other screenroll used for other purposes.

That I claim is Y Y 1. In a screen roll, a drum having a cylinder'formedof suitable light material and heads of heavier material, and means forexpanding said heads in relation to the drum cylinder. V

2. In a screen roll, a drum having a cylinder of wire mesh and heads ofheavier material and means for expanding said heads in relation to thedrum cylinder.

3. In a screen roll, a drum having a wire mesh cylinder mounted on endflanges and supported centrally from said flanges, and means forexpanding said flanges in-relation tothe drum cylinder.

4. In a screen roll, a drum having a wire mesh cylinder terminating ateach end in solidrings suitably supported from a central bearing andmeans for expanding said rings in relation to the drum cylinder.

5. In a screen roll, a drum having a wire mesh cylinder and solid ringsat the ends thereof and gear members supporting said rings and suitablyjournalled, and means for expanding said rings in relation to the drumcylinder. I

6. In av screen roll,'a drum having a wire mesh cylinder and endflanges, gears secured to said flanges and suitably journalled, coinderformed of wire mesh and heads of I acting gears and shaft mountingsuitably journalled, means for driving said drum, and means forexpanding said flanges in relation to the drum cylinder.

7. In a screen roll, a cylindrical wire mesh screen having sliding endmountings and means therewithin for expanding said mountings.

8. In a screen roll, a cylindrical wire mesh screen having sliding endmountings and trunnions therefrom, means for driving said screen, andmeans for maintaining said mountings in an extended position and thescreen in tension.

9. In a screen roll, a cylindrical wire mesh screen having solid endflanges, gears secured to said flanges and having trunnions therefromand forming driving transmission gears having a common shaft mountingsuitably j ournalled and avoiding distortion of the roll, a coactingdriving gear suitably journalled and driven and means exerting acontinuously spreading pressure on said flanges and said gears tomaintain said screen in tension.

10. In a screen roll, a cylindrical wire mesh screen having heads ofheavier metal in the form of gears and flanges and trunnions therefrom,sliding brackets forming bearings for said trunnions, fixed bracketssupporting said sliding brackets and means for exerting an end pull onthe roll ends from said sliding brackets and for maintaining said screenin tension.

11. In a screen roll, a cylindrical wire mesh screen having journalmembers secured to the ends thereof, sliding brackets forming bearingsfor said journal members, fixed brackets having slideways for saidsliding brackets, gear mechanism mounted in said sliding brackets and onsaid journal members and screen, means for driving said gear mechanismsand means for exerting continuous outward pull on said journal membersfrom said sliding brackets.

12. In a screen roll, a cylindrical wire mesh screen having journalmembers secured to the ends thereof, bearings for said journal membersautomatically adjustable and means contiguous to the roll cylinder forexerting con stant tension thereon and coincidently adj usting saidbearings.

13. In a screen roll, a cylindrical wire mesh screen demountably securedto journal members, adjustable bearings for said journal members andexpansile means for exerting pull on the journal members and formaintaining the screen in tension.

14. In a screen roll, a cylindrical wire mesh screen secured to journalmembers, bearings slidably mounted, and a cylinder and pistonrespectively mounted on said bearing and connected to an expansile fluidsupply.

15. In a screen roll, a drum having a cylheavier material, pistonsoperatively con nected to one head and cylinders connected to asuitable'fluid supply and operatively connected to the other head andexpanding said drum lengthwise through the endwise expansion of theheads.

16. In a screen .roll, a cylindrical screen, a driving gear at one endthereof, a coacting driving gear, a coacting adjusting gear andoperatlng gear mounted in a bracket having a manually operated shaft forwithdrawing the adjusting gears from coaction and flange mountings forsaid screen secured to said coacting adjusting gear in its adjustedposition.

17 In a device of the kind described, a screen and means operativelyconnected with the ends of the screen and exerting a continuous pullthereon in opposite directions While the screen is in operation.

Signed at Quebec this seventeenth day of November, 1928.

JOSEPH LEON BERGERON.

